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          Hive注释中文乱码
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<h1 id="1-Hive注释中文乱码"><a href="#1-Hive注释中文乱码" class="headerlink" title="1. Hive注释中文乱码"></a>1. Hive注释中文乱码</h1><p>创建表的时候，comment说明字段包含中文，表成功创建成功之后，中文说明显示乱码</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">create</span> <span class="keyword">table</span> if <span class="keyword">not</span> <span class="keyword">exists</span> capacity_stats_live_access (</span><br><span class="line">  id <span class="type">bigint</span> comment <span class="string">&#x27;主键&#x27;</span>,</span><br><span class="line">  device_num <span class="type">varchar</span>(<span class="number">100</span>) COMMENT <span class="string">&#x27;设备号&#x27;</span>,</span><br><span class="line">  start_time <span class="type">timestamp</span> COMMENT <span class="string">&#x27;调阅开始时间&#x27;</span>,</span><br><span class="line">  finish_time <span class="type">timestamp</span> COMMENT <span class="string">&#x27;调阅结束时间&#x27;</span>,</span><br><span class="line">  duration <span class="type">int</span> COMMENT <span class="string">&#x27;耗时，单位秒&#x27;</span>,</span><br><span class="line">  response <span class="type">int</span> COMMENT <span class="string">&#x27;调用结果 1.成功 0.失败&#x27;</span></span><br><span class="line">) COMMENT <span class="string">&#x27;直播调阅日志统计&#x27;</span>;</span><br></pre></td></tr></table></figure>

<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/hive%E4%B8%AD%E6%96%87%E6%B3%A8%E9%87%8A%E4%B9%B1%E7%A0%81.png" alt="Hive%E6%B3%A8%E9%87%8A%E4%B8%AD%E6%96%87%E4%B9%B1%E7%A0%81%2044812d6495e341f4aec7117aac2ec503/Untitled.png"></p>
<p>这是因为在MySQL中的元数据出现乱码</p>
<h1 id="2-针对元数据库metastore中的表-分区-视图的编码设置"><a href="#2-针对元数据库metastore中的表-分区-视图的编码设置" class="headerlink" title="2. 针对元数据库metastore中的表,分区,视图的编码设置"></a>2. 针对元数据库metastore中的表,分区,视图的编码设置</h1><p>因为我们知道 metastore 支持数据库级别，表级别的字符集是 <code>latin1</code> 。</p>
<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/Untitled%201-20201102170449594.png" alt="Hive%E6%B3%A8%E9%87%8A%E4%B8%AD%E6%96%87%E4%B9%B1%E7%A0%81%2044812d6495e341f4aec7117aac2ec503/Untitled%201.png"></p>
<p>那么我们只需要把相应注释的地方的字符集由 latin1 改成 utf-8，就可以了。用到注释的就三个地方，表、分区、视图。如下修改分为两个步骤：</p>
<h2 id="2-1-进入数据库-Metastore-中执行以下-5-条-SQL-语句"><a href="#2-1-进入数据库-Metastore-中执行以下-5-条-SQL-语句" class="headerlink" title="2.1. 进入数据库 Metastore 中执行以下 5 条 SQL 语句"></a>2.1. 进入数据库 Metastore 中执行以下 5 条 SQL 语句</h2><p>修改表字段注解和表注解 <code>COLUMNS_V2</code>，<code>TABLE_PARAMS</code> </p>
<p>修改分区字段注解 <code>PARTITION_PARAMS</code>，<code>PARTITION_KEYS</code> </p>
<p>修改索引注解<code>INDEX_PARAMS</code> </p>
<h2 id="2-2-修改-metastore-的连接-URL"><a href="#2-2-修改-metastore-的连接-URL" class="headerlink" title="2.2. 修改 metastore 的连接 URL"></a>2.2. 修改 metastore 的连接 URL</h2><p>修改hive-site.xml配置文件</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">property</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">name</span>&gt;</span>javax.jdo.option.ConnectionURL<span class="tag">&lt;/<span class="name">name</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">value</span>&gt;</span>jdbc:mysql://IP:3306/db_name?createDatabaseIfNotExist=true&amp;useUnicode=true&amp;characterEncoding=UTF-8<span class="tag">&lt;/<span class="name">value</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">description</span>&gt;</span>JDBC connect string for a JDBC metastore<span class="tag">&lt;/<span class="name">description</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">property</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h2 id="2-3-验证"><a href="#2-3-验证" class="headerlink" title="2.3. 验证"></a>2.3. 验证</h2><p><img src="https://gitee.com/littlefxc/oss/raw/master/images/Untitled%202-20201102170449708.png" alt="Hive%E6%B3%A8%E9%87%8A%E4%B8%AD%E6%96%87%E4%B9%B1%E7%A0%81%2044812d6495e341f4aec7117aac2ec503/Untitled%202.png"></p>
<p>发现注释还是乱码。</p>
<p>把表删除然后重新创建。效果如下：</p>
<p><img src="https://gitee.com/littlefxc/oss/raw/master/images/Untitled%203-20201102170449863.png" alt="Hive%E6%B3%A8%E9%87%8A%E4%B8%AD%E6%96%87%E4%B9%B1%E7%A0%81%2044812d6495e341f4aec7117aac2ec503/Untitled%203.png"></p>

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